public class TestCls
	{
		public DateTime dt1 { get; set; }
		public List<DateTime> ListDate { get; set; }
		public int id { get; set; }
	}

	public static bool IsSerializable<T>(T obj)
		{
			Type myType = obj.GetType();
			

			bool myBool = myType.IsSerializable;

			if (obj is ISerializable)
				return true;
			return Attribute.IsDefined(obj.GetType(), typeof(SerializableAttribute));
		}

public class TestCls
	{
		public DateTime dt1 { get; set; }
		public List<DateTime> ListDate { get; set; }
		public int id { get; set; }
	}

private static void RefObj22<T>(T obj)
		{
			Type type = obj.GetType();

			var propertyInfoArray = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);

			foreach (var propertyInfo in propertyInfoArray)
			{
				var propValue = propertyInfo.GetValue(obj, null);
				if (propValue == null)
					continue;
				if (propValue.GetType().Name == "DateTime")
				{
					bool b0 = false;
					Console.WriteLine(propValue.GetType().Name);
				}
				else
				{
					RefObj22(propertyInfo);
				}
			}
			
		}